• Late Medieval and Renaissance history
• Italy, 1250-1559
• Florence: political, socioeconomic, constitutional, and cultural history
• Intellectual history of Western Europe, 1300-1600

Articles and Essays: 

• Forthcoming: “‘Occupare la tirannide’: Machiavelli, the Militia, and Guicciardini’s Accusation of Tyranny,” in Quaderni di Rinascimento, 2006.
• Forthcoming: “Alberti on Love: Musings on Transgression and Discipline,” in a volume to be published by the Centre for Renaissance and Reformation Studies of the University of Toronto.
• Forthcoming: “Studi americani sulla cultura e sulla storia sociale e politica dell’Italia comunale (secc. XII-XIV),” in the acts of the Pistoia conference of April 2005 on “La civiltà comunale italiana nella storiografia internazionale”.
• Forthcoming: “The Building of Florence Cathedral: A Political Interpretation,” in a volume on Arnolfo di Cambio to be published by the Villa I Tatti.
• “Florentine Politics and Urban Spaces,” in Renaissance Florence: A Social History, eds. R. J. Crum and J. T. Paoletti (New York: Cambridge University Press, 2006), pp. 19-54, 483-91.
• “Arms and Letters: The Crisis of Courtly Culture in the Wars of Italy,” in Italy and the European Powers: The Impact of War, 1500-1530, ed. C. Shaw (Leiden and Boston: Brill, 2006), pp. 207-38.
• “Political History and Political Thought,” in Palgrave Advances in Renaissance Historiography, ed. J. Woolfson (New York: Palgrave MacMillan, 2004), pp. 270-97.
• “[Renaissance] Political Ideas,” in A Companion to the Worlds of the Renaissance, ed. G. Ruggiero (Oxford: Blackwell, 2002), pp. 384-402.
• “Giannozzo and His Elders: Alberti’s Critique of Renaissance Patriarchy,” in Society and Individual in Renaissance Florence, ed. W. J. Connell (Berkeley and Los Angeles: University of California Press, 2002), pp. 51-78.
• “Politics: Class and Patronage in Twentieth-Century Italian Renaissance Historiography,” in The Italian Renaissance in the Twentieth Century, ed. A. Grieco, M. Rocke, and F. Gioffredi Superbi (Florence: Leo S. Olschki and Villa I Tatti, The Harvard University Center for Italian Renaissance Studies, 2002), pp. 119-36.
• “Civic Humanism and Florentine Politics,” in Renaissance Civic Humanism, ed. James Hankins (Cambridge: Cambridge University Press, 2000), pp. 75-104 (anthologized in The Italian Renaissance, in the series “Bloom’s Period Studies” [New York: Chelsea House, 2004]).
• “Florence,” in The Dante Encyclopedia, ed. R. H. Lansing (New York: Garland Publishing, 2000), pp. 386-403.
• “Una grande crisi dimenticata,” preface to I consigli della repubblica fiorentina: Libri fabarum XIII e XIV (1326-1331), ed. L. De Angelis (Rome: Pubblicazioni degli Archivi di Stato: 2000), pp. vii-xvi.
• “Papirius and the Chickens, or Machiavelli on the Necessity of Interpreting Religion,” Journal of the History of Ideas 60 (1999): 659-81.
• “The Life of Machiavelli” and “[Machiavelli] The Political Theorist,” in Encyclopedia of the Renaissance, ed. P. F. Grendler (New York: Charles Scribner’s Sons, 1999), vol. 4, pp. 1-8.
• “Republicanism,” in Encyclopedia of the Renaissance, ed. P. F. Grendler (New York: Charles Scribner’s Sons, 1999), vol. 5, pp. 313-22.

• In progress: “The Cambridge Companion to Machiavelli”
• A History of Florence, 1200-1575 (Oxford: Blackwell, 2006).
• (Editor and contributor) Italy in the Age of the Renaissance, 1300-1550 (Oxford: Oxford University Press, 2004).
• Between Friends: Discourses of Power and Desire in the Machiavelli-Vettori Letters of 1513-1515 (Princeton, N.J.: Princeton University Press, 1993).
• Corporatism and Consensus in Florentine Electoral Politics, 1280-1400 (Chapel Hill, N.C.: University of North Carolina Press, 1982).